666166226 has 24 divisors (see below), whose sum is σ = 1099707840. Its totient is φ = 302428280.

The previous prime is 666166219. The next prime is 666166283. The reversal of 666166226 is 622661666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 318155 + ... + 320241.

It is an arithmetic number, because the mean of its divisors is an integer number (45821160).

Almost surely, 2^666166226 is an apocalyptic number.

666166226 is a deficient number, since it is larger than the sum of its proper divisors (433541614).

666166226 is a wasteful number, since it uses less digits than its factorization.

666166226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3430 (or 3419 counting only the distinct ones).

The product of its digits is 186624, while the sum is 41.

The square root of 666166226 is about 25810.1961635320. The cubic root of 666166226 is about 873.3618224233.

The spelling of 666166226 in words is "six hundred sixty-six million, one hundred sixty-six thousand, two hundred twenty-six".